<template>
  <div id="app">
    <!-- <el-button>按钮</el-button> -->
    <div class="box">
      <div class="left"></div>
      <div class="mid"></div>
      <div class="right"></div>
    </div>
  </div>
</template>

<script>
import HelloWorld from './components/HelloWorld.vue'

export default {
  name: 'App',
  components: {
    HelloWorld
  }
}
</script>

<style lang="less" scoped>
div#app {
  
  div.box {
    display: flex;
    width: 100%;
    height: 100vh;
    flex: 1;

    
    div.left {
    flex: 1;
    background-color: aqua;
    }

    div.mid {
    flex: 1;
    background-color: pink;
    }

    div.right {
    flex: 1;
    background-color: powderblue;
    }
  }
}
</style>